Regulating system.



H. A. LAYGOCK.

REGULATING SYSTEM.

APPLIUATION FILED APR. 28,1913.

1,109,236, Patented Sept. 1, 1914.

Witnesses Y Inventor-I 6M wZMA. Mar-r 504; Lagcock, 55g 6 5 Maw;

His fit igorneg.

UNITED STATES PrEENT OFFICE.

HARRY A. LAYCOCK, OF SCI-IENECTADY, NEXV YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

WEGULATING SYSTEM.

Specification of Letters Patent.

Patented Sent. i, t;

2 0 all whom it may concern Be it known that I, HARRY A. LAYcocK, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented new and useful Improvements in Regulating Systems, of which the following is a specification.

My invention relates to means for regulating the electrical condition, that is, voltage, current, or power factor of a system of electrical distribution, and more particularly to means of that character which includes a vibrating contact regulator such as that disclosed in Tirrill Patent #726,234.

The object 'of'my invention is to increase the range of regulation which may be socured by such means.

Regulators of the vibrating contact type such as that disclosed in Tirrill Patent #726,234, have one of the electromagnetic ,coils which actuate the said contacts connected across the exciter leads. lVhcn a single exciter is used, the range of regulation is considerably limited be ause of the fact that it is not feasible to reduce the excitation o'l the exciter field'so that it approaches zero. This is because such a procedure would. cause the vibration of the regulator contact controlled by the electromag netic coil connected across the cxciter leads to cease and it has been found .in practice that good regulation can not be secured when there is at times a cessation of the said vibration.

According to my invention I connect in opposition two sources of electrical energy, at least one of. which is a dynamo clcctric machine, for supplying the excitation directly or indirectly to the main dyuamocltaztric machine and connect an olcctromaguctic coil controlling a contact of the regulator across the armature leads of one of the exciting dynamo electric machines, it' two are used, which is also the machine whose ex citation controlled by the said regulator, or if one machine and a battery or other source of energy are used, then the regulator coil is connected across the armature leads of the machine. lhe said .macninc is preferably dcsigncd to be of a higher voltage than the source of elccl'romotivc force which opposes it. The result secured by this system is that while the voltage or current delivered to the main machine is the dill'crcnce between that of the two sources, that delivered to the regulator coil is that of one of the same.

One application of my invention in to systems wherein a synchronous condenser is used to keep the voltage at a point 'r. the hne constant. This is done by var ing :ho field excitation of the symhronous iil denser according to the said voltage b means eta regulator of the vibral inn conta t: type such as that disclosed in Tirrill Pol -n11 #726,234. On long transmission lin it frequently occurs that the voltage is h :cr at the receiving end than at the (llStlllHliillLl' end, and in order to take care of such a roiilition, the excitation of the condenser on be practically zero. By the use oi my iuvcution, this may be readily accomplished. with out causing the regulator contacts to cease vibrating.

lVIy invention will be more clearly undcrstood by reference to the acconipanyiog drawing in which a system embodying my invention is illustrated diagramnn'dicallv.

In the drawing .10 represents the rub of an alternating current distribution tom. Connected across the said mains i symchronous motor 11. The licld oi said motor is excited by the direct ran-r" cxciter 13. The field it of the said M. is in turn excited by the direct rurrrn craters 15, 16. The generator iso higher voltage than the generator l instance. the generator l5 may be o3 volts maxinnun, while the generator in is a volts maximum. The said genes: are so connected that they ()PPOSQ each o-i r and the energy supplied tothe field H is tho dillercutial of that generated by the machincs. At the left of the ligurc is shown a regulator such as that disclosed in T 'rili Patent #726,234 and consisting oi the looting Contact 17 which is actuated by an elecl'romagnet consisting of coil 18 \vhicn is con ncctcd across the distributing main il and the coil 19 which is counts-ted in series illfiil.- with both acting upon the core 20 \y 5 connected to a lever carrying the atorwa: contact. The vibrating contact :21 i---' atcd by an electron:agnct consisting coil 522 which connected to one oil from the generator .15 and to the point 2 between the generators iii The aforesaid contact serves to out in out through the relay ii. the resistance 1 the licld 2(3 of the generator to.

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26 of the r ne ator 16 has included therein a variable stance 2'? It Will be apparent "from the foregoing that the field it: of the ezrciter 13 Will receive the differential between the voltages of the generators 1: 3 and Tlho Voltage of the generator 15 Wi be controlled by means of the vibrating regulator. The voltage or the generator 143 may he initially adjusted by means of the resistance 27 and will remain constant thcrcatter. a fhcn the voltage of the gIl1"2Ltt 1 is at a :znaximum, say, volts, a W the generator 16 is at 125 volts, rential, namely, volts, will be supplied to the field l l Then bot-h generators 1-5 and it; 125} volts the result will be Zero and. the synchronous condenser will have practically no excitation. However, at such times the coil 22 of the regulator will receive current at 125 volts. It is apparent therefore that the excitation of the synchronous coi'idenser can be reduced practically to zero Without reducing the energy supplied to the coil 22 in Way detrimental to the action of the regulator.

Various modifications of the above described structure will suggest themselves to those skilled. in the art, and are to he considered as coming within the spirit and scope of my invention as set forth in the annexed cl What It claim new and desire to secure by Letters Patent of the United States, is

1. means for regulating the electrical condition of a circuit comprising a dynamo electric machine connected thereto and an exciting means forthe said machine comprising two sources of electrical energy connected in opposition, at least one of said sources being a dynamo electric machine, and means controlled by the electrical. con" dition of the aforesaid circuit and. of the latter dynamo electric machine for regulating the field excitation of the said machine.

2. A means for regulating the field encitation of a dynamo electric machine comprising two sources of electrical energy connected in opposition, one of said sources being a dynamo electric machine, and a regulater of the Vibrating contact type for the field oi the latter dynamo electric machine having an electromagnetic coil connected across the armature leads thereof.

3. ll. means for regulating the excitation of a dynamo electric machine comprising two sources of electrical energy connected in opposition, one of said sources being a dynamo electric machine, and a regulator of the vibrating contact type having coils connected across the leads of the former and latter dynamo electric machines respectively.

A. system for regulating theelectrical condition of a circuit comprising a dynamo electric machine and means for exciting the field thereof comprising two sources of elec trical energy connected in opposition, one of said sources being a dynamo electric inachine, and a regulator of the vibrating con- I tact type for the field of the latter dynamo electric machine having an electromagnetic coil connected in the aforesaid circuit and another coil connected across the armature leads of: the machine.

5. A. means for regulating the field excitation of a dynamo electric machine comprising a pair of generators connected in opposition and a' regulator of the vibrating contact type for the field of one of said generators having an electromagnetic coil connectcd across the armature leads of the said generator.

A. means for regulating the field of a dynamo electric machine comprising a pair exciting generators connected in oppositi on and a regulator of the vibrating contact typefor one of the same having a coil connected with the circuit to be controlled and the other across the armatureleads of the resulated generator.

7. A system for regulating the electrical condition of a circuit comprising a dynamo electric machine, and means for exciting the hold of the same comprising a pair of gencraters connected in opposition and a regulator oi the vibrating contact type for the lield of one of said generatorshaving an clectronmgnetic coil connected to the aforesaid circu t and another coil. connected across the armature leads of the regulated generator.

in witness whereof, I have hereunto set my hand this 25th day of Aprilltlil.

HARRY A. LAYCOCK.

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